physical education. n. (Education) training and practice in sports, gymnastics, etc, as in schools and colleges. Abbreviation: PE. physâ²ical educaâ²tion. n. instruction in sports, exercise, and hygiene, esp. as part of a school or college program.
3. Stress/injury. Stress on the tissues or any type of injury in the mouth can cause canker sores. Since the sores are actually tiny ulcers, they can be caused by any kind of hard brushing or eating something that can cause bruises or lead to tissue inflammation in the mouth.
Before they become obvious spots or blisters, cold sores and canker sores may cause swelling on the roof of your mouth. Stress and hormonal changes may trigger a canker sore. Many canker sores develop on your cheek or the gums near your teeth, but itâs not uncommon for them to appear on the roof of your mouth, too.